unbuntu20.04安装mysql5.7

下载文件：https://blog.csdn.net/wap816/article/details/107460974

安装：http://www.chaona.net/linux/ubuntu-install-mysql.html

参考：https://www.jianshu.com/p/ba48f1e386f0

无法下载的话可以在csdn下载（需要5积分）：https://download.csdn.net/download/zwx_lucky/13120250

依次安装

sudo dpkg -i

libmecab2_0.996-10build1_amd64.deb

libtinfo5_6.2-0ubuntu2_amd64.deb

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mysql-common_5.7.30-1ubuntu18.04_amd64.deb

mysql-community-client_5.7.30-1ubuntu16.04_amd64.deb

mysql-client_5.7.30-1ubuntu16.04_amd64.deb

mysql-community-server_5.7.30-1ubuntu16.04_amd64.deb

设置外网可连接：

登录mysql

use mysql;

update user set host='%' where user = 'root' limit 1;

quit;

重启:sudo service mysql restart

配置文件位置：etc/mysql/mysql.conf.d

卸载8.0：https://www.cnblogs.com/zhangxuel1ang/p/13456116.html

卸载5.7：

查看安装了哪些：dpkg --list|grep mysql

卸载：

sudo apt-get autoremove --purge mysql-community-server

sudo apt-get autoremove --purge mysql-community-client

sudo apt-get remove mysql-common

清除残留数据: dpkg -l|grep ^rc|awk '{print$2}'|sudo xargs dpkg -P